Not so great in bed all of a sudden...

We have been together for a year. We both have really high sex drives. Its been amazing. We are lkke twice a day kind of people (minus my period because its too messy in my opinion. But my period only lasts 3-4 days so its just head for him)

Anyways. Idk if he's overly stressed. He says that he's fine and not stressed. But with work and stuff getting busy we arent banging as much. I didn't see him for three weeks. And I figured when we were able to do it it would be crazy and good. He got semi hard then went soft and then that was it. Two days later, making out, getting hot and heavy, we're naked and at the point where it should have gone in. But he was soft. Sucked to see if that would get him going and it was semi hard but no where close to being enough to go inside or stay up on its own. Im confused as hell. He was like i want to but its just not working.

We arent old. And we are fairly active people. I am 24 and he is 26. I dont want to be rude but I want to suggest a doctor...